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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b31f3d55d78102b4cebd30ceb99608399c94633f594a5c496b5cc370458a01' 
  AND token = 'jfcSrqlmeYxvaHHP3zRa/isPKLXXEijZiuCLGadze6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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