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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f1d04fb2fcf1f32f2a6129c8db9b23347b709f9969d1a2de06e9581863337b' 
  AND token = 'n2/CN+r6Vzc9BXiKitf1yPYrc6GQFML+lADM/6T8srk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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