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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70021056666028d9e6bb2da6f8088ee4fef26c1ac7176ef781ec1d0bdb4a6e07' 
  AND token = 'qtsvs3CGfdcgLGgquN20fonCId56r6H2S9c8RvHuCJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}