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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7adb4e0bc6cf85399c92508faf738b343e35b441aad7006c0bb8a3bca63c89d' 
  AND token = 'prUn8pZpYE1CjV+5hDqyTBbOEPOdLo+n8y8MPJ5H1/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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