SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234c5d28fa9343b22d9150c1f7d3312692c490b8a04c6417b440f0a685c99a95' 
  AND token = 'bwnJ+VAYjmKXZu+6LMDgniplf/tjFyyTYYmpn3sLBQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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