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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a3a7d117e06e1e7e789e252080b58331e3cc85f1cb5d1afa800734dd90c3f7' 
  AND token = 'zNpZOGpgnZU+WQ55qHRTF7Rt2/gMsB1raxWedBp8Tg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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