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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77e4c82e9246aebd90e4ea649fd4f26533b72b035405041a5c40194fcfee0fc' 
  AND token = 'XWkdHs/RP5kIZYnWAZuQ5W6Rcsu29Du1ngAHxhWY9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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