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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c47abc9b95f2a8d00336399471ac04ceffb3ed786f2a249f007a7c7cbc2e89' 
  AND token = 'KuFvVyW6Trx7j0MdzLHQJe29d0DruRnHjO11bOxZupM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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