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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55ac89eea930f5215565d28f0e73d84d36a9230326077447b43b575f2490463' 
  AND token = '9fJ4NQAiFnQdFtRsCchrjAWqoq8D33m3pxM3gqTAhsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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