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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a4a39ef21f042deb8c520a1932b7049e704d59f9e2d4993302f1ece841fb18' 
  AND token = '6/GKAV57Zt2VMMVZfSMZThg65f3Q0D5H1Dl9oBahHFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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