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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262d130881e64e8e71a212313146be6c507f5c7667b65588be47366992f10227' 
  AND token = 'M4JHZccy+7NvZ5iw5rtKXIPA90g9KTFBHg4+9qS4vB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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