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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b04d3235dd102636d9e807bcca2f4a2520715e51d8056a3dcaa754c1c4cc959' 
  AND token = 'G10IXXu2MSnZfzSpXx4Ezs1s8W6tLUhhadx6JAn0hK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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