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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d93cff2bb50504e21133a7d3a342ad339567608dd980b42a6b6889dec6b377e' 
  AND token = 'W9AEYYy6JOAdQ6N134C00d9hzmxDSVeYVT3jegiollM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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