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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da334e6e79c598c03e4a0b4cea72fb2b53dca61d0613ff123ca5f5918b4faf1' 
  AND token = 'wjR1TruigBSTRISaY53V9gkUB4g9d1qFaAMtdyNER5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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