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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617b7410f165826286d5bfd028744932ef128191b46c689af20afd32bc383a38' 
  AND token = 'ew2lGXqs7O4Em/CsNdWf091PeR+gKTaI9gxOoTPk2fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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