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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1417d33371046bc0200105225e369f0cae6924cadba394ad430c28d0c1d94db9' 
  AND token = 'zCwq9sQqKrV71Hz8SfKrxwm2+1D/0I4fUeVQm/UqbfY=' 
  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"
    }
  }
}