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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5817f89c74f345ffaa3f391e40ef6a941b200450e11cc8197112db9093750a12' 
  AND token = 'Xqyg9m3j3UCEL01hYvFcqtDI24v8wFR70zDmzAx0wuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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