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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e3887b8559e5c7acce1ad08168af652eba44b4c4d870719a8553c86ce0f52b' 
  AND token = '/26b7pCpW8In79uXTxUuWOHzv1j/0JQHfn0/JQNISog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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