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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c4fd0d5a9ebbdf77512abf20e4ec697f456cfad1fcdb699ad55f061637a616' 
  AND token = 'Mw2h7x+1SbOgK6py3W3/5bSnTOswcFKN2EkJYOZndto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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