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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d89f96de60235cd85e2316c47dea0e74b094fab2d213e3cbcb0fede8c7d84de' 
  AND token = 'oA5SShYhKCMk1Jw/Zssj64+7+We2JqGPyo3lScfktcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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