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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e4508c500d3d954f3cd24ee7c733c41f7291247a03e402d238ebc9126f9281' 
  AND token = '0GleqallUNqRrzLh0UH+ZsXwzBd6CzYNtjc9FAsIclk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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