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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaa6db5421fa9f4fcb6806b285e01ef400b5273fc2ac3cbb3df0bd518e3187b' 
  AND token = 'enj3GYq425pIAmVWxjfYJH6d6msg3jt22d9YvguMroc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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