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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0543e9085eab427fc26792e42b18b02ae69fc07a35dd932e242c589a21b9202e' 
  AND token = 'tp6AXqRviYnr56YHWvSv3jyWbBpCSK8hbhelUCrQ+zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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