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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf699d8f6116cea8e5690151b702d12e9d2e068abb3f501fda9ad17697f58d2' 
  AND token = '5lOhbjHIImeQrduYwD7G5uVeILgEqDh2EGmhc9eIV9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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