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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3ff4d266d9ae00e822e37d4abcdb4145b5a169c48196ed2078181399a6f35f' 
  AND token = '5DlhfrqhtLZrkOykBPTPPhJUp8ByWkM5t/XfX2XBW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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