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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3455ce7613d5650072a4128aea1b0c5f7ca6b19d03d0893fdd5a6670ea50f3d4' 
  AND token = 'DzNJCg3YkojmNaXC/Ji9bYoO39QJ3/kvXrXBih/XIpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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