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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed873d040ff7598cc106a7775c79b575073d24eb266eb7dcaedcfe0ef54e042' 
  AND token = 'GZz7z5a7tObiM7NQJOeQZldXzZIEgmPJS6Gwo1MHK2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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