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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fabde4f11409d81b1c6c21854626ad6f07ce854cbe9bc2a118257c882d57a2' 
  AND token = 'cNRhzcy8DzFyL20kqEyCQQfV0CdDNdO/x8L0Ui8TbF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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