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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805f2a99ba48cc12281c934bfba4d2b98447c40f0962e2e00caae416d3c391f5' 
  AND token = 'FFpP+ZYfEN5+LmA9Nae474ynYCq83eR7DZCZ4gEEg2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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