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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e23049d4dd4c77894005de4e9772faa040578cfa338f50b3f12d6906217704' 
  AND token = 'FKRas+ZBylrleRVwo/ueCl/CasR//BIBwKb/vko6ieY=' 
  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"
    }
  }
}