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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa2a034a35434b07b1b355f7adac12b9815a216d134876f8b0a993810bc5e13' 
  AND token = '2k3jNq3qKq132liegY8Nk3zLQFUwoUfwRCMrloze1kE=' 
  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"
    }
  }
}