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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e608a41cbddc89ee6c56c8298468c86dbbf41989023ce1d6e8e7f372f98d9a1' 
  AND token = 'jma4r3v1qUISnI6/Ln3mTN0l7jsM5ZxfigtFazs81Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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