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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d92508e4cc3831877225822bbb606a1108d66a6b044e8110b92b25390c66e9' 
  AND token = 'l5oV1wly5QX7D+PBpik7bsdD1pH99a2wsVWi0Efw1c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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