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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9412e8717bba971af2bd524f852469a8e81d4d56c5b70d472905fa7f600a4749' 
  AND token = 'eG5SE1g9gi484eJJ8XLtAbes1dXANHz4I2GP34/09vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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