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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d626ce96c861085cb8fd4491275ed714f26ea6079c0495a91f02ebd6ad181a' 
  AND token = '2R1i9QHQRpncGM3JmFHUicO0dXKkXRrwwJP6LCcWUX8=' 
  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"
    }
  }
}