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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3d1f3b39a80d9a4544ebd0480c826e0dd02e1518886912dddaa5349e3b55f5' 
  AND token = 'gGWquN88LcRIkMZ5NDzhga5PKh/HGCLK5Eat6gzmKBU=' 
  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"
    }
  }
}