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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb991a13f5883a29ab20af559e7c91de26c28b3d47963a50dd440a10999de25a' 
  AND token = 'YtKA1UCQDgmvwuAvBNHSxij7jIDHHHF8O8Stgem9lSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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