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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce2df86b94fd3ed971b06be9ae992634ab25849dcf86d48ffbe8f75c3876f8d' 
  AND token = 'Hfj/ScyJuJd5+GOJt9i5TL3vuN/sBg0LfCq7e4wAPDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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