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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf881ea947de27c5b77ab62ed73d193dcded654484a22f2e667c9de05315bda' 
  AND token = 'njfpUVCSdTdS8G0wnQ+ktyF5Fr8v95gcZnn8LQDQjss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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