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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0907c39116aceb06d1e16f1e572f212c211231933143d02541b268064cba4288' 
  AND token = 'TXDhKDV2N7W1V0en2vthmVwSTOmcQ1erxq0xYjEy1Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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