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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c94657b03310cb54dc037827802f3375bfe332d1981ab5b06e415580eb0cc95' 
  AND token = 'ad7afqbOdIfayau16MsrgnvmdzT7Bg4Faz+OkoSB7t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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