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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1ea23cd35997cce7e8000cdb83bea69c81f86b26e94264973809069f6463b8' 
  AND token = 'HDVftfBPSijtRW5qToFOqoGNLDf8I42wfYMSMxOsAM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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