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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b9e5b35f33ccd9b3463469469477ebe38d0ac42dfa9210c15459c625a6a8bd' 
  AND token = 'zHa0YJ57QHW1ZFyOulVl58IuAOpdNhLkYoiKYs9IGCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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