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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2d9d3c77cdf74ec3dd62c1d15299cc13e551c01904cabc16316967da40b241' 
  AND token = 'EsmpI9FZ6KHhm6cXQF1wB+vUEITB+l9g7ksenjTIvWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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