Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac626a5060481b8714f6115359522bec899b368d888d70faf1c2f6c5cb458198' 
  AND token = '1F3lZWAj3JAgDp/yrWrdRn59TE2pa3VWXhMkzMEniVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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