SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03befc028a24a425c724c26b35fa3f5b8471ffab32244e61fbb857c2146237b4' 
  AND token = 'I+qWk5HG8O6p95uaZX0nwWj6Qnq9TI6XZrJzkVVTBqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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