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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a941adfbbb9ae9d28064e76bc9b463865560ca806eea349c5d3b597b767d4c' 
  AND token = 'YrylI9S1X7emn80caJq44Q9sImlOKX+XtfMFZlJ/UkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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