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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36658a3cf5ac72b7d4e29d52b2079ef25626e8f9f97717694a13e4126e50163' 
  AND token = 'nzAXtmBzSiNvmee9JK7sP5fJj9LXmKVR2fnai3s+UaQ=' 
  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"
    }
  }
}