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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5efbf39c2d8a290fe76955d803d58ce12cc1c0f4a5d11ca78362de5cd74131' 
  AND token = '/Sn5Vkx5xn7St4DacTa970AVRb/7COabpmJK8EdMuyY=' 
  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"
    }
  }
}