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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6202ab29ef08cd2cf99368fa0e667f99ce38bfeb9376f31e45ac40acf42ce7c' 
  AND token = 'OUT9B9ak+N9Sq1LeduEBHVfJzsfLFx54FiTHoudSsLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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