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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4407f1ae08601cd23caeb74c642811d4e2efa0432ab0f7e1a4680a2e777142' 
  AND token = '1WXwi8Wv49BeHwCMPYb0zaTl2HzsbSBvtcVhxp8CRu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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