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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51360374334b3d1d8f64f4f1b091d673fc22511cba7d359e8941740af319ea4' 
  AND token = 'LPzLrBsAMqi3aDsOY4uIAHswO5AXVI2ZWW+GAIBwcVc=' 
  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"
    }
  }
}