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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53396d26d9fd6bb715e4dfa98e2c46b365a890aba3cfe5745900c9124827afe' 
  AND token = 'LkhA1hA528MB6FYOoFsf6h0TlXWw2V8Y0XZHtMxFY10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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