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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcc0c96f8c4e530b02d8e1a6f4ee4543ada89e79adbc6ea8be1e8de6f123242' 
  AND token = 'gnRrr2oaP3ygRTt4Kw0/3Nn34qrO6JXRGClmsQVhDIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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