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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a525e7236de580b8b776d9077adb52bbdee23e520d7c8658924b64653b642dbb' 
  AND token = 'dJ8IIYllfvjiQZyEj0WzvbF8zJYjgbg0D9XXWa52quA=' 
  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"
    }
  }
}