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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a6c513b1f4ba4a6299931e52123483774cf02a371c8a97072c8cce46cfc76e' 
  AND token = 'DP7MrcWO20Ft1p8FOnEnaVvm0w9RlHM8W5sb+OJbJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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