SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f929620181e68553d58d292c6faf031d4216c59d71ce05ba2df4a8f32845cc' 
  AND token = 'gzcBG+RyeGLg++l4aL5qNQhADnE6IJ4UgZVowkpXOL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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