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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9beed6a4c943c1746247fd05fb2cb2816db85d29eef0bc060072d9189e78af' 
  AND token = 'LJvO34jfWSjqHQ2Jy4/mFC5alRe5uGCexA3KE63sktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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