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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d94101f5e271449a3be6b3c7156bce778694693f2cf33426a3599fc9069ae13' 
  AND token = '++v3Ke300Oe8cj4WIgL78em0GpNV7d3ZiFiaTzyp9lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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