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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a014aa08159a89ec821a56d32fc6c880921afe4fa2e8cc81064f4eda7df1c54' 
  AND token = 'l06JBZttErbwQ4wJFklK9Zkl7m/NtvN1GLY2K3gDVH8=' 
  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"
    }
  }
}