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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568843b3babc7a97caf2a528f1467409fe8d1f53a283b18aa0c7c6d9b3504589' 
  AND token = 'dfWOKafv3OhZiRedE5ZakRwA5SIn9IzuIa4BnPfZRRo=' 
  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"
    }
  }
}