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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d1e42a5401b12dcf1565aafb6238d757a2b16a9dcebcb83f841a64f9168e06' 
  AND token = '39CugdLHzjXKoipEvQr+SF/NXa3iF138qoTGEXcJAg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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