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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e55ab6a8bb8b6eeb9aac2452540dc8a16c1ff5a61b65ecf33c0d006e5d31c72' 
  AND token = 'C+o6QdgJbINJ2+nPvVVe+UpkQqUVFeJFsmRPURDDE6E=' 
  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"
    }
  }
}