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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd967eb4c2819cc5015a44a3b401f115dde8b528b9cec1e3a89e6d428f86d5ab1' 
  AND token = 'p7vCSFanvbW6Gu5Ix+Zq4k7VUpMGRooHddZ4wCsZlGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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