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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69997a61fd7c68c83c5fad119e3cec186b935f9bf82d013dc2e6b76cd5f53fc' 
  AND token = 'd5Tb9B0ZsagJtiE2n+nYS4EkPANCPmSOsLIdzKNo4iI=' 
  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"
    }
  }
}