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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd02fd5d4f736d9a7290839b53e257717afcfad294d650dc1bc75d6ff7aa7d' 
  AND token = 'XX7d6gbT9sTjeZPTcL9DlcV+YQx4bOZ7HOsbUTC/lF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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