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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e16f03023d7198b0e4e44db95f5b27d67ae16b775712832544cd24e1fc2840e' 
  AND token = 'ypRsODAADQqL0dYHqn2ZWZMU6N9GRX3Wrd3qmueMRH0=' 
  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"
    }
  }
}