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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9c708108b3c662cdc380f8ce606b3458e0f2c1b4869dea0a5b86dc9e95da0a' 
  AND token = 'clJUYRa5peCUQfqOzUKdW2il3bHxApPcipLOgbBegno=' 
  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"
    }
  }
}