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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2885b42e1ea6be4878e73a8d184e9c222adf6ad6007d775b4e42bc1d47dc2ba3' 
  AND token = 'h/FTl5YXfDqIdZR1B4f4U6JopF5my0vLHJatOftLa8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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