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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936ecd7935f79c206f30cc9c7c3ed92b7909f2f00a356b1e8cf05dd85b295db5' 
  AND token = 'nySyxl6ccnxjaEUZ1ir4tW0nwIfG8384es6VTY/g/1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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