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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e485bff5769c65640aae5935b9edbe52e9792e6480ff7a22b5af9f81518dfd5' 
  AND token = '3DTHMzDRuBvIWzFLeuKnl5hrEAiRa82CWcoz95BBdXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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